interface Phone {
    void receiveMessages();
    void call();
}
interface  SmartPhone extends Phone{
    void faceTime();
}
class MIPhone implements SmartPhone{
    public  void useMIUI(){
        System.out.println("使用MIUI");
    }
    @Override
    public void receiveMessages() {
        System.out.println("接受语音");
    }

    @Override
    public void call() {
        System.out.println("语音通话");
    }

    @Override
    public void faceTime() {
        System.out.println("视频通话");
    }

}

public class Test2 {
    public static void main(String[] args) {
        MIPhone miPhone=new MIPhone();
        miPhone.receiveMessages();
        miPhone.call();
        miPhone.faceTime();
        miPhone.useMIUI();
    }
}